You could do brain surgery while fully conscious because the brain itself has no sense organs to it.

你完全可以在意识清醒的状态下,接受脑部手术,因为大脑本身并没有任何的感觉器官

耶鲁公开课 - 心理学导论课程节选

Your brain is active as if you were awake, your EEGs are similar to waking, paralyzed except for the eyes, oh, men get erections and you have dreams.

大脑处于活跃状态，像清醒时一样，脑电图也和清醒时相似，但除了眼部，全身都不会动，男人会勃起，梦境会出现。

耶鲁公开课 - 心理学导论课程节选